With this action the EPA initiated development of a national primary drinking water regulation (NPDWR) that, once finalized, will require certain potable water suppliers to take corrective action for high perchlorate levels. For more information on this regulatory action can be found here.
Dionex has been at the forefront of collaborating with the EPA Office of Ground Water and Drinking Water in Cincinnati, aiding in the establishment of EPA methods 314, 314.1, 314.2, 331, and 332 for determination of perchlorate. We recommend EPA 314.0 for analysis of drinking water and the more robust 314.2 for source waters with high amounts of chloride, carbonate, and sulfate.
Further information can be found the perchlorate page of the Dionex website.